How would I diagnose a broken chest freezer?

I have a Norfrost Aura chest freezer that suddenly stopped working yesterday. The freezer hasn't been moved and nothing unusual happened for it to stop working. It has a faint flashing green light on the front and a 'boost' switch that still lights up. I would like to try and repair this freezer but I... show more I have a Norfrost Aura chest freezer that suddenly stopped working yesterday. The freezer hasn't been moved and nothing unusual happened for it to stop working. It has a faint flashing green light on the front and a 'boost' switch that still lights up.

I would like to try and repair this freezer but I have no idea where I would even start to diagnose the cause of the problem. I'm assuming the thermostat might need replacing but I don't want to waste my money on unnecessary parts.

Any advice?
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